2. Inland lakes and ponds in temperate regions. 
a. Perennials, seeds, spores, akinetes, hormogones. 
b. Annuals. 
3. Note Lemanea in winter streams. Bacteria in ice. 
Division of water plant societies. 
1. Hydrophytic societies—fresh water or limnetic plants. 
2. Halophytic societies=marine or pelagic plants. 
Il:~ Fresh water or Limmetic: Societies: 
Pond or inland lake societies. 
Vegetation zonal. 
1. Littoral zone, or semi-aquatics. 
2. Mid zone, plants with floating leaves and slender 
stem. 
3. Submerged zone, pond weed type and Chara. 
Free floating forms are found in Ist and 2nd zones. 
River or Fluvial plant societies. 
Plants adapted to rapid and violent movement of water. 
River-weed, mosses and algae, Podostemon. 
Where water is quieter, pool or pond types. 
Structural types of Jjimnetic plants. 
I. Quillwort type. ° 
2. Waterlily type. 
Bey ed: weed May pe: 
4. Duckweed type. 
5. River-weed or fluvial type. 
Til. Marine or Pelagic Societies, 
Mostly lithophytes and sea algae. , 
1. Benthonic forms mostly lxthophytic. 
Disk-like hoidfasts of large forms. 
Diatoms with gelatinous stems. 
Large number of small ones, Epiphytes. 
Many semiparasites among algae. 
Few fungus parasites. 
ee few attached to mud or sand bottoms. 
Flora very scarce and corresponds with deserts. 
Caulerpa, root like holdfasts. 
' Meadow or sea weed in shallow places. 
Photic region 30-40 meters (100-125 ft.) 
An pwd 
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